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wonderboy 575 engine question

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I have 2 wonderboy 575 tiller stear mowers.1 has a B&S model 142302 engine and the other one as a B&S model 143302 Now from what I can find that would make the engines about a 1962 model year but I thought they only made the tiller stear one year 1954.If this is true how did 2 different riders from different parts of the state come up with engines that new and that close in model numbers? Bob ?

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On the Simple trACtors site, there is information on 1959 and 1962 with nothing on the two years between. 1959 shows a tiller steer Wonderboy, and 1962 shows a steering "wheel" Wonderboy. The model number of your engine has nothing to do with the year in which it was made. That information is in the "code"(serial) number. The only difference in the model numbers of your engines, is the "design series" number. It can tell you if your engine was built before or after a certain date, such as when Briggs went from the "three leg" armature (ignition coil), to the two leg armature, but it could also represent a concurrently produced difference, such as a cast iron cylinder sleeve vs. a plain aluminun cylinder. Pat

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